I recently installed Visual Studio Tools for Apache Cordova CTP 3.1 in Visual Studio 2013 with Update 4 and when trying to build I kept getting the error:

Command failed with exit code 8 Visual Studio - mdavscli

The problem was that I has upgraded my version of Android SDK which was not compatible.

To troubleshoot this I turned on the diagnostic build here is how:

Go to Tools –> Options –> Projects and Solutions –> Build and Run, change MSBuild project build output verbosity to Diagnostic. Rebuild the project and post the text from output window

The output window showed the following error:

BUILD FAILED
C:\Programs\SDK\tools\ant\build.xml:597: The following error occurred while executing this line:
C:\Programs\SDK\tools\ant\build.xml:649: The following error occurred while executing this line:
C:\Programs\SDK\tools\ant\build.xml:694: Execute failed: java.io.IOException: Cannot run program
“C:\code\samh\platforms\android\CordovaLib\${aapt}”
(in directory “C:\code\samh\platforms\android\CordovaLib”): CreateProcess error=2,

after a little research I found out it looks like ant commands are broken in Android SDK 24.3, which cordova build is using.
I downgraded to previous release (24.2.0) and ant works fine now.

I downgraded to the following version of the sdk http://dl-ssl.google.com/android/repository/tools_r24.2-windows.zip 

To downgrade:

I am currently working on a project that takes advantage of some DevExpress components. Recently we ran into an issue where ASPxDateEdit caused the parent page to scroll if the control was used in an IFrame. Oddly enough this issue only happened on Chrome (and potentially other webkit browsers), but not on IE.

The only way we were able to sole this issue was to add the following css to the control

-webkit-backface-visibility: hidden;

in my case I was working with ASPXDateEdit so I added it to DevExpress’s

.dxeCalendar class.

At the time of writing this I am using DevExpress WebForms version 14.2.7 (released 22-APR-2015)

Today I ran into this error when posting back on my ASP.NET page.

System.Web.HttpUnhandledException (0x80004005): Exception of type ‘System.Web.HttpUnhandledException’ was thrown. —> System.ArgumentException: Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation=”true”/> in configuration or <%@ Page EnableEventValidation=”true” %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.
at System.Web.UI.ClientScriptManager.ValidateEvent(String uniqueId, String argument)

It did not take me long to track down the problem. I forgot to add an ID to a dynamically created dropdownlist control.